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Placement of three electrodes, Fz, Cz and Pz, relative to the skull and the brain of a border collie (as an example of a dog with mesocephalic head type). (a) Computerized tomography (CT) image in the midsagittal plane of the skull with the brain. (1) Frontal sinus and (2) external occipital protuberance. (b) Volume-rendered CT scan of the skull, left lateral view. (c) The volume-rendered CT scan of the skull, which was cut in the midsagittal plane, together with the brain.
